llvm.org GIT mirror llvm / 0aa075f
New Test-Case for Region Analysis While working on improvements to the region info analysis, this test case caused an incorrect region 1 => 2 to be detected. It is incorrect because entry has an outgoing edge to 3. This is interesting because 1 dom 2 and 2 pdom 1, which should have been enough to prevent incoming forward edges into the region and outgoing forward edges from the region. Reviewers: grosser Subscribers: llvm-commits Contributed-by: Nandini Singhal <cs15mtech01004@iith.ac.in> Differential Revision: https://reviews.llvm.org/D30603 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296988 91177308-0d34-0410-b5e6-96231b3b80d8 Tobias Grosser 3 years ago
1 changed file(s) with 33 addition(s) and 0 deletion(s). Raw diff Collapse all Expand all
0 ; REQUIRES: asserts
1 ; RUN: opt -regions -analyze < %s | FileCheck %s
2 ; RUN: opt < %s -passes='print' 2>&1 | FileCheck %s
3
4 ; While working on improvements to the region info analysis, this test
5 ; case caused an incorrect region bb2 => bb3 to be detected. It is incorrect
6 ; because bb2 has an outgoing edge to bb4. This is interesting because
7 ; bb2 dom bb3 and bb3 pdom bb2, which should have been enough to prevent incoming
8 ; forward edges into the region and outgoing forward edges from the region.
9
10 define void @meread_() nounwind {
11 bb:
12 br label %bb1
13
14 bb1: ; preds = %bb4, %bb
15 br label %bb2
16
17 bb2: ; preds = %bb1
18 br i1 true, label %bb3, label %bb4
19
20 bb3: ; preds = %bb2
21 br i1 true, label %bb4, label %bb5
22
23 bb4: ; preds = %bb3, %bb2
24 br label %bb1
25
26 bb5: ; preds = %bb3
27 ret void
28 }
29
30 ; CHECK: [0] bb =>
31 ; CHECK-NEXT: [1] bb1 => bb5
32 ; CHECK-NEXT: End region tree